package com.zhiying.web.util;

import java.security.MessageDigest;

public class MD5Util {

        private MD5Util(){}

        private static final String[] HEX_DIGITS = { "0", "1", "2", "3", "4", "5",
                "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

        /**
         * 转换字节数组为16进制字串
         * @param b 字节数组
         * @return 16进制字串
         */
        public static String byteArrayToHexString(byte[] b) {
            StringBuilder resultSb = new StringBuilder();
            for (int i = 0; i < b.length; i++) {
                resultSb.append(byteToHexString(b[i]));
            }
            return resultSb.toString();
        }

        private static String byteToHexString(byte b) {
            int n = b;
            if (n < 0)
                n = 256 + n;
            int d1 = n / 16;
            int d2 = n % 16;
            return HEX_DIGITS[d1] + HEX_DIGITS[d2];
        }

        public static String md5Encode(String origin) {
            try {
                MessageDigest md = MessageDigest.getInstance("MD5");
                return byteArrayToHexString(md.digest(origin
                        .getBytes()));
            } catch (Exception ex) {
                return "";
            }
        }

        public static void main(String[] args){
            String pass = "shurlyn123";
            String gen = md5Encode(pass);
            System.out.println(gen);
        }

}
